Rev.3.00, Jul.15.2005, page 1 of 7

HD74LS194A

4-bit Bidirectional Universal Shift Register

REJ03D0456–0300

Rev.3.00

Jul.15.2005

The bidirectional shift register is designed to incorporate virtually all of the features a system designer may want in a

shift register. The circuit contains 46 equivalent gates and features parallel inputs, parallel outputs, right-shift and left-

shift serial inputs. Operating-mode-control inputs, and a direct overriding clear line. The register has four distinct

modes of operation, namely;

• Parallel (broadside) load

• Shift right (in the direction Q

• Shift left (in the direction Q

• Inhibit clock (do nothing)

the clock input. During loading, serial data flow is inhibited. Shift right is accomplished synchronously with the rising

Clocking of the flip-flop is inhibited when both mode control inputs are low.

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS194AP

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74LS194AFPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Pin Arrangement

(Top view)

GND

15

16

1

2

3

4

5

6

7

14

8

9

10

11

12

13

CLR

R

L

D

B

A

CK

Clear

Shift Right

Serial Input

A

B

C

D

Shift Left

Serial Input

Clock

C

Parallel

Outputs

Mode

Control

Parallel

Inputs